RE: (PM) Netmask on dialup (fwd)

MegaZone (megazone@megazone.org)
Thu, 11 Jun 1998 11:43:31 -0700 (PDT)

Once upon a time Steve Walker shaped the electrons to say...
>Once upon a time Abdul-Jalil Kanaan shaped the electrons to say...
>>If you use "Framed-IP-Netmask = 255.255.255.224," you will assigne an IP
>>to the caller from the IP pool, on the other hand you will specify an IP
>This is doubly wrong.
>1. .224 is wrong in ANY case, it is .254
>2. Framed-IP-Netmask has nothing to do with the address.
>
>Just a question seeing this thread with 'Framed-IP-Netmask =
>255.255.255.255' i have a simple question, we have dynamic and fixed IP
>customers, do we use the .255 Netmask or .254 for those entires? as some say
>255 others 254 and reading here it looks like 255.255.255.254 is the Netmask
>? does it ,matter for fixed or dynamic? and can it just be left in DEFAULT ?

Ok, Framed-IP-Address and Framed-IP-Netmask are being confused.

Framed-IP-Netmask should ALWAYS be 255.255.255.255 for any single-IP dialin
user. 255.255.255.254 would route TWO IPs to the customer - if the PM
has 'set user-netmask on'. If not, it is moot - since the PM will ignore
the RADIUS Netmask and use 255.255.255.255 by default. However, this can
easily bite you later if you turn this on to get VLSM/CIDR support on
dialin. So, unless you KNOW you NEED to route multiple IPs to a dialin
user, mare SURE the Framed-IP-Netmask is 255.255.255.255. If you need to
route multiple IPs, set the netmask accordingly (and 'set user-netmask on').

Now, Framed-IP-Address has two special values. 255.255.255.254 is what most,
nearly all, people will be using. That means 'assign this user an IP out of
your local pool'. 255.255.255.255 is the other special value. That means
'let the user pick ANY IP'. This is dangerous, for reasons that should be
obvious, and should NEVER be used. (Those who know they need it also know
well enough to ignore absolute statements - if you have any doubts, don't
use it.)

-MZ

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